avail Number of Blades: 6, 8, 12
avail Core Diameter (inch): 8 1/2"×4", 8 1/2"×4 1/8"
avail Models: GMC1306, GMC1308, GMC1312
Brand Great Drill Bit Co. Ltd.
Bit Sizes (inch): 5 1/2", 6", 6 1/4" to 19 1/4"
IADC Codes: S617G, S517, 517, 117, 437, 137, 617, 114, 111, 537, 127, 217, 417
Tooth Types: TCI, Steel
Brand Great Drill Bit Co. Ltd.
avail Bit Sizes (inch): 7 1/2", 8 3/8", 8 1/2"
avail Inner Diameter (inch): 4", 4 1/8"
avail Weights (kg): 15, 24, 26
Bit Sizes (inch): 8 1/2", 9 1/2" to 17 1/2"
IADC Codes: 127, 217, 517, 527, 535, 537, 637
Tooth Types: Steel, TCI, Sphere
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